GRE SC, why the answer is A, not B?

ilovepsycho

New member
1. A(n) ________ attitude at a critical time such as this is not justified by the somber news reaching us from the war front.

a. sanguine
b. pessimistic
c. salubrious
d. arbitrary
e. sordid

I think the answer is B, someone say to me that's A.
What do you think of that? Please tell me why you think so?
 
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